The input is a 1kHz 0V…5V pulse train coming from the output of a 74HC74, and the output is a square wave around 10mV pk-pk.
Here are the input signal in time domain and its FFT:
And here are the output signal in time domain and its FFT:
I have questions about interpreting and reducing noise here.
1-) The FFT of output signal has two high freq. spikes. How can we interpret it? Does that mean it has 500kHz and 750kHz high freq. noise?
2-) Is it possible to eliminate those high freq. noise by not effecting the square wave form much? The output will be sampled with an ADC less than 100kHz sampling rate. So do I still need to eliminate that high freq. noise